It also accused the rebels of “unlawfully” confiscating food and medical supplies from civilians there.

“The pro-Huthi forces should take all possible steps to minimise harm to civilians, end the unlawful confiscation of essential goods from civilians and hold accountable commanders responsible for unlawful attacks,” the rights group said.

The Huthis overran the capital Sanaa in September 2014 and went on to seize control of several regions, aided by Saleh’s forces.

In July, loyalists backed by a Saudi-led Arab coalition evicted the rebels from five southern provinces and have set their sights on Sanaa.

Around 4,500 civilians have been killed in the conflict since March, when the coalition began targeting the rebels in air strikes.